Data modem



FIG. 1 is a front elevational view of a data modem showing my novel design;

FIG. 2 is a rear elevational view of the novel design;

FIG. 3 is a side elevational view of the novel design;

FIG. 4 is a top view of the novel design;

FIG. 5 is a bottom view of the novel design; and

FIG. 6 is a perspective view of the novel design. 

The ornamental design for a data modem, as shown. 